5 minutes

The science behind this whole process!

Consider a bookmaker offering a promotion: a free £10 bet upon placing a £10 bet on any event. For simplicity, let's use a coin toss with two outcomes, heads or tails, each equally likely (50/50).

If you wager £10 on both heads and tails, you break even regardless of the outcome, meeting the criteria for the free £10 bet without risk. The table below depicts the scenario:

£10 on heads/£10 on tails outcome =

  • If heads wins + £10 – £10 (loss on tails).

  • If tails wins – £10 loss on heads + £10 (win on tails).

Despite breaking even, you qualify for the free bet by placing the required £10 bet.

To lock in a profit, repeat the process using the free bet and a £5 bet on the opposing outcome. The table below demonstrates this strategy:

£10 free bet on heads/£5 on tails outcome =

  • If heads wins + £10 – £5 (loss on tails) = £5 profit!

  • If tails wins + £5 - £0 (loss on heads free bet) = £5 profit!

Utilising a calculator helps determine the optimal £5 stake for equal profits regardless of the outcome. In practical matched betting, you can often extract around 80% of the free bet value. For instance, with a £10 free bet, you might make approximately £8 profit.

Congratulations! You've grasped the fundamental concept of matched betting. While events with more outcomes or varied odds may require adjustments, the basic principle remains consistent.

Learn how to start matched betting with my side gig.